Accumulated Other Comprehensive Income (Loss) Accumulated Other Comprehensive Income (Loss) (Schecule of amounts reclassified from AOCI) (Details) - USD ($) $ in Millions		12 Months Ended
		Jul. 30, 2017	Jul. 31, 2016	Aug. 02, 2015
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, before Tax [Abstract]
Reclassification adjustment for (gains) losses included in net earnings, before tax		$ 11	$ (9)	$ (1)
Reclassification adjustment for (gains) losses included in net earnings, tax expense (benefit)		(4)	2	1
Reclassification adjustment for (gains) losses included in net earnings, after-tax		7	(7)	0
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, before Tax, [Abstract]
Reclassification of prior service credit included in net earnings, before tax	[1]	(25)	(1)	(2)
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Tax [Abstract]
Total Pension and Other Postretirement Benefit amortization included in net earnings, tax expense (benefit)		9	0	1
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax [Abstract]
Total Pension and Other Postretirement Benefit amortization included in net earnings, net of tax		(16)	(1)	(1)
Foreign Exchange Contract [Member] | Cost Of Products Sold [Member]
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, before Tax [Abstract]
Reclassification adjustment for (gains) losses included in net earnings, before tax		6	(11)	(4)
Foreign Exchange Contract [Member] | Other Expenses/Income [Member]
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, before Tax [Abstract]
Reclassification adjustment for (gains) losses included in net earnings, before tax		1	(2)	(1)
Interest Rate Contract [Member] | Interest Expense [Member]
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, before Tax [Abstract]
Reclassification adjustment for (gains) losses included in net earnings, before tax		$ 4	$ 4	$ 4

[1] This is included in the components of net periodic benefit costs (see Note 10 for additional details)